XML 72 R56.htm IDEA: XBRL DOCUMENT v3.8.0.1
Employee Benefit Plans - Plan Assets and Projected Benefit Payments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension      
Fair value of plan assets $ 166,587 $ 167,843  
Actuarial assumptions:      
Expected rate of return on plan assets for 2017 net periodic benefit cost (as a percent) 7.00%    
Equity securities      
Pension      
Target allocations for plan assets (as a percent) 65.00%    
Common Stock      
Pension      
Fair value of plan assets $ 9,660 10,201  
Equity funds - large cap index      
Pension      
Fair value of plan assets $ 92,731 93,576  
Fixed income securities      
Pension      
Target allocations for plan assets (as a percent) 35.00%    
Fixed income funds - diversified bond      
Pension      
Fair value of plan assets $ 63,768 63,613  
Short term investment funds      
Pension      
Fair value of plan assets 428 453  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Pension      
Fair value of plan assets 9,660 10,201  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common Stock      
Pension      
Fair value of plan assets 9,660 10,201  
Significant other observable inputs (Level 2)      
Pension      
Fair value of plan assets 156,927 157,642  
Significant other observable inputs (Level 2) | Equity funds - large cap index      
Pension      
Fair value of plan assets 92,731 93,576  
Significant other observable inputs (Level 2) | Fixed income funds - diversified bond      
Pension      
Fair value of plan assets 63,768 63,613  
Significant other observable inputs (Level 2) | Short term investment funds      
Pension      
Fair value of plan assets 428 453  
Pension      
Pension      
Fair value of plan assets 166,587 $ 167,843 $ 156,678
Expected company contribution 5,400    
Projected benefit payments      
2018 43,041    
2019 12,912    
2020 13,442    
2021 11,871    
2022 13,458    
2023 through 2027 54,687    
Projected benefit payments 149,411    
Other Postretirement Benefits      
Pension      
Expected company contribution 3,300    
Projected benefit payments      
2018 3,284    
2019 3,435    
2020 3,541    
2021 3,556    
2022 3,504    
2023 through 2027 16,628    
Projected benefit payments $ 33,948